Remove duplicate rows from CSV files. Select which columns define a duplicate, preview the removal count, and download the deduplicated dataset.
Open CSV Deduplicator → free, no sign-inDuplicate rows in a CSV are a common problem — especially when combining exports from multiple sources, or when data has been appended over time. The CSV Deduplicator lets you define what 'duplicate' means: select the columns that should be unique, preview how many rows will be removed, and download the deduplicated file. Clean data, no repeated entries.
Marketing teams deduplicating contact lists, analysts cleaning up merged datasets, developers preparing import files that require unique records — any situation where duplicate rows need removing without losing real distinct entries.
No tutorials. No learning curve. Open it and get started.
No server uploads. Column-level duplicate definition means you can deduplicate on a composite key — not just row-level identical duplicates.
Completely free. No trial period. No premium tier for basic functionality. No account required. Use it as often as you need.
One job, done well. CSV Deduplicator was built to solve a specific problem cleanly. No feature bloat, no ads, no distractions.
What counts as a duplicate?
Rows where the selected columns have identical values — you define what 'unique' means by choosing the key columns.
Which duplicate is kept?
You can choose to keep the first or last occurrence.
What if I want all columns to match?
Select all columns — only exactly identical rows will be treated as duplicates.
Is the original data sorted differently?
The output preserves the original row order with duplicates removed.
Can this handle large files?
Yes — processing is local so performance depends on your device.
Free. Instant. No sign-in. Open it and get the job done.
Open CSV Deduplicator on Doathingy.com →